US10269129B2 - Color adjustment method and device - Google Patents

Color adjustment method and device Download PDF

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US10269129B2
US10269129B2 US14/981,912 US201514981912A US10269129B2 US 10269129 B2 US10269129 B2 US 10269129B2 US 201514981912 A US201514981912 A US 201514981912A US 10269129 B2 US10269129 B2 US 10269129B2
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color space
frame data
target
linear
color
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US20160189399A1 (en
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Anyu Liu
Chuanshun Ji
Guosheng Li
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Xiaomi Inc
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Xiaomi Inc
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    • G06T7/408—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/90—Determination of colour characteristics
    • G06K9/4652—
    • G06K9/4661—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/60—Memory management
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/40—Analysis of texture
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/40—Extraction of image or video features
    • G06V10/56—Extraction of image or video features relating to colour
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/40—Extraction of image or video features
    • G06V10/60—Extraction of image or video features relating to illumination properties, e.g. using a reflectance or lighting model
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6002—Corrections within particular colour systems

Definitions

  • the present disclosure relates to a computer graphics field, and more particularly, to a color adjustment method and a color adjustment device.
  • the present disclosure provides a color adjustment method and a color adjustment device.
  • a color adjustment method includes: obtaining frame data from a frame buffer; mapping the frame data from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space; mapping the frame data in the linear original color space to a linear target color space, so as to obtain frame data in the linear target color space; and performing a gamma correction process on the frame data in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • a color adjustment device includes: a processor; and a memory, configured to store instructions executable by the processor, in which, the processor is configured to: obtain frame data from a frame buffer; map the frame data from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space; map the frame data in the linear original color space to a linear target color space, so as to obtain frame data in the linear target color space; and perform a gamma correction process on the frame data in the linear target color space by using a target gamma coefficient, so as to obtain the frame data in a target color space.
  • a non-transitory computer-readable storage medium having stored therein instructions that, when executed by a processor of a device, causes the device to perform a color adjustment method.
  • the method includes: obtaining frame data from a frame buffer; mapping the frame data from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space; mapping the frame data in the linear original color space to a linear target color space, so as to obtain frame data in the linear target color space; and performing a gamma correction process on the frame data in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • FIG. 1 is a flow chart of a color adjustment method according to an exemplary embodiment.
  • FIG. 2A is a flow chart of a color adjustment method according to another exemplary embodiment.
  • FIG. 2B is a flow chart of a de-gamma correction method according to an exemplary embodiment.
  • FIG. 2C is a schematic diagram of frame data conversion according to an exemplary embodiment.
  • FIG. 3 is a block diagram of a color adjustment apparatus according to an exemplary embodiment.
  • FIG. 4 is a block diagram of a color adjustment apparatus according to an exemplary embodiment.
  • FIG. 5 is a schematic diagram of a color adjustment device according to an exemplary embodiment.
  • a target device in the present disclosure may be a cell phone, a tablet PC, an E-book reader, a MP3 (Moving Picture Experts Group Audio Layer III) player, a MP4 (Moving Picture Experts Group Audio Layer IV) player, a laptop computer, a desktop computer, etc.
  • a MP3 Moving Picture Experts Group Audio Layer III
  • MP4 Moving Picture Experts Group Audio Layer IV
  • RGB Red, Green, Blue
  • CMY Cyan, Magenta, Yellow
  • HSV Hue, Saturation, Value
  • the sRGB (standard Red, Green, Blue) color space developed by Microsoft Corporation with Hewlett-Packard Development Company, Mitsubishi Group and Seiko Epson Corporation is used as an universal color standard, and is supported by most of the target devices.
  • FIG. 1 is a flow chart of a color adjustment method according to an exemplary embodiment, which is implemented by a target device. As shown in FIG. 1 , the color adjustment method comprises the following steps.
  • step 101 frame data is obtained from a frame buffer.
  • step 102 the frame data is mapped from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space.
  • step 103 the frame data in the linear original color space is mapped to a linear target color space, so as to obtain frame data in the linear target color space.
  • step 104 a gamma correction process is performed on the frame data in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • the color adjustment method by performing the de-gamma correction process on the frame data from the frame buffer, mapping the de-gamma corrected frame data to the linear target color space, and performing the gamma correction process on the frame data in the linear target color space to obtain the frame data in the target color space, the consistent display effect of the same frame data on different devices is realized.
  • FIG. 2A Taking a CIE (Commission Internationale de L'Eclairage) xyY color space as an example of the original color space and taking a sRGB color space as an example of the target color space, the embodiment shown in FIG. 2A may be illustrated as follows.
  • CIE Commission Internationale de L'Eclairage
  • a linear CIE xyY color space is mapped to a CIE xyY color space after a gamma correction, and a linear CIE xyY color space is obtained after performing a de-gamma correction on the CIE xyY color space.
  • a linear sRGB color space is mapped to a sRGB color space after a gamma correction, and a linear sRGB color space is obtained after performing a de-gamma correction on the sRGB color space.
  • different target devices may describe the frame data by using different color space, and may use different gamma coefficients to perform the gamma correction process on the frame data, a great deviation may be generated between frame data displayed on different target devices after performing respective gamma correction process on the same content to be displayed. Therefore, the method shown in FIG. 2A may be used to work on the inconsistency of displaying results of the same frame data on different devices.
  • FIG. 2A is a flow chart of a color adjustment method according to another exemplary embodiment, in which the color adjustment method is used in a target device and realized by an application program operating in the underlying layer of the target device. As shown in FIG. 2A , the color adjustment method may comprise the following steps.
  • step 201 frame data is obtained from a frame buffer.
  • the frame buffer of the target device is used to store the frame data to be displayed, and content to be displayed corresponding to the frame data may be an image, a video or a user interface, etc.
  • a certain linear original color space may be used to describe the frame data, according to the type of the content to be displayed.
  • a linear CIE xyY color space is used to describe the frame data.
  • linear original color space such as a linear CMY color space and a linear HSV color space, which is not limited in the present disclosure.
  • the manufacture of the target device may add a third party application in an operation system layer or an application layer of the target device, such that the target device can perform a gamma correction process on the obtained frame data and send the gamma corrected frame data to the display device for displaying the image corresponding to the gamma corrected frame data, thus ensuring the image displayed brighter or more real. Therefore, the frame data to be displayed stored in the frame buffer is usually the frame data after the gamma correction process by the target device.
  • the target device maps the frame data in the linear original color space to the original color space, for example, the operation system layer or the application layer of the target device maps the frame data in the linear CIE xyY color space to the CIE xyY color space via a built-in gamma correction process.
  • gamma coefficients may be used by different target devices to perform the gamma correction process on the frame data.
  • step 202 the frame data is mapped from the original color space to the linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space.
  • the target device Since the frame data to be displayed stored in the frame buffer is the frame data after gamma correction process by the target device, a great deviation may exist in the image displayed on the display device if the gamma corrected frame data is directly mapped to the target color space and then the mapped frame data is sent by the target device to the display device. Therefore, the target device needs to map the frame data from the original color space to the linear original color space, in which the frame data in the original color space is the frame data after gamma correction, and the frame data in the linear original color space is the frame data before the gamma correction.
  • the target color space is the color space to which the target device wishes to map the frame data.
  • the target device may map the frame data from the original color space to the linear original color space via a de-gamma correction process, which is shown in FIG. 2B .
  • a gamma coefficient is obtained.
  • the gamma coefficient is an coefficient to be used by a target device for performing a gamma correction process on the frame data in the linear original color space at an operation system layer or at an application layer.
  • step 202 b a de-gamma correction process is performed on the frame data in the original color space by using the gamma coefficient, so as to obtain the frame data in the linear original color space.
  • the target device usually performs the gamma correction process on the fame data in the operation system layer or in the application layer by using a third-party application. If information about respective third-party applications and a relationship list of gamma coefficients used by respective third-party applications is stored in the target device, the target device may detect the information about the third-party application used by the target device, and find the corresponding gamma coefficient from the relationship list according to the third-party application information. If there is no information about respective third-party applications and no relationship list of gamma coefficients used by respective third-party applications stored in the target device, the target device may measure the display effect via an instrument, thus obtaining the gamma coefficient.
  • the target device may perform a de-gamma correction process on the frame data at the underlying layer according to the gamma coefficient, and map the frame data from the original color space to the linear original color space, so as to obtain the frame data in the linear original color space, in which the frame data in the linear original color space is the frame data without the gamma correction.
  • the underlying layer of the target device performs the de-gamma correction on the frame data which has been gamma corrected by the operation system layer or by the application layer, and maps the frame data from a CIE xyY color space to a linear CIE xyY color space.
  • a length of data in each color channel of the frame data in the linear original color space is dispersed from a first bit length to a second bit length, wherein the second bit length is greater than the first bit length.
  • the target device After mapping the frame data from the original color space to the linear original color space, the target device needs to perform a series of conversion operations on the frame data before obtaining the frame data in the target color space, in which some deviation will occur in the frame data conversion.
  • the target device may disperse the length of the data in each color channel of the frame data from the first bit length to the second bit length, and the second bit length is greater than the first bit length. In other words, the length of data in each color channel of the frame data is increased, thus, the greater the second bit length is, the more accurate the frame data is.
  • the target device may increase the length of the data in each color channel of the frame data by using an interpolation method. For example, if the first bit length is 8 bit, the target device may insert 4 bit data in the data of each color channel, such that the length of the data in each color channel of the frame data is extended from 8 bit to 12 bit, thus increasing the accuracy of the frame data. For another example, if the first bit length is 8 bit, the target device may insert 8 bit data in the data of each color channel, such that the length of the data in each color channel of the frame data is extended from 8 bit to 16 bit, thus further increasing the accuracy of the frame data.
  • the target device may increase the length of the data in each color channel of the frame data by using other methods, which will not be elaborated herein.
  • the first bit length may be greater than the second bit length, thus realizing the compression of the frame data, and reducing the calculation work of the target device.
  • step 204 the frame data in the linear original color space is mapped to a linear target color space, so as to obtain frame data in the linear target color space.
  • the target device may map the frame data in the linear original color space to the linear target color space using a conversion formula, in which different conversion formulas are used for mapping the frame data in different linear original color space to the same linear target color space.
  • the conversion process is described as follows, by taking the linear CIE xyY color space as an example of the linear original color space, and taking the linear sRGB color space as an example of the linear target color space.
  • the X value, Y value and Z value are respectively converted to R value, G value and B value in the linear sRGB color space using a color space conversion matrix:
  • Parameters in the color space conversion matrix are industrial standard parameters, which may be adjusted a little by engineers according to actual requirements.
  • the frame data may be mapped from the linear CIE xyY color space to the linear sRGB color space.
  • step 205 a color correction matrix of the target device is obtained, and the color correction matrix is used to correct the frame data in the linear target color space, so as to obtain the corrected frame data in the linear target color space.
  • the target color space being the sRGB color space
  • the target device may correct the frame data in the linear target color space by using the color correction matrix, the color correction matrix being a deviation matrix obtained in the target color space according to deviations between color data of the target device and standard color data.
  • the color correction matrix may be obtained in the following way.
  • the target device may multiple each color channel with the deviation matrix, such that the target device may display the image effect consistent with the standard sRGB image when displaying the frame data in the sRGB color space, thus eliminating the color cast.
  • the target device may multiple each color channel with the deviation matrix according to a formula of
  • K is a degree coefficient
  • step 205 may be omitted.
  • step 206 a gamma correction process is performed on the frame data in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • the target color space is the sRGB color space
  • the color space is sRGB color space
  • the gamma correction process with the gamma coefficient 2.2 the image effect displayed is closest to the effect of real image. Therefore, before sending the frame data to the display device, a gamma correction process with the gamma coefficient 2.2 is usually performed on the frame data.
  • the target device may convert respective R, and B values in the linear RGB color space to corresponding respective R, G, B values in the sRGB color space by using the following conversion formulas.
  • C linear is R linear , G linear , or B linear ;
  • Parameters in the conversion formulas are industrial standard parameters, and may be adjusted a little by engineers according to actual requirements.
  • step 207 if displaying the length of the data in each color channel of the frame data in the target color space as the second bit length is unsupported by the target device, the length of the data in each color channel of the frame data in the target color space is changed from the second bit length to the first bit length.
  • the target device Since in step 203 , the target device extends the length of the data in each color channel from the first bit length to the second bit length so as to reduce the deviation caused by conversion, the length of the data in each color channel of the target color space obtained by the target device may also be the second bit length.
  • the target device If displaying the length of the data in each color channel of the frame data in the target color space as the second bit length is unsupported by the target device, the target device, before sending the frame data to the display device, needs to change the second bit length to the first bit length that is supported by the target device.
  • the target device may, before sending the frame data in the target color space to the display device, remove data with 4 bit length from the data in each color channel, thus changing the length of the frame data in each color channel to 8 bit that is supported by the target device.
  • step 208 the frame data in the target color space is sent to the display device for displaying.
  • the target device After obtaining the frame data in the target color space which is supported by the target device, the target device sends the frame data to the display device for displaying.
  • the same frame data are in different color spaces for different target devices.
  • the same frame data in different original color space at different target devices may be converted to the frame data in a same target color space, and displayed on displays of different target devices with the same display effect.
  • FIG. 2C which is a schematic diagram of frame data conversion according to an exemplary embodiment
  • the corresponding color space in the frame buffer of a target device A is the CIE xyY color space, and a correction with a first gamma coefficient has been performed in advance
  • the corresponding color space in the frame buffer of a target device B is the CMY color space, and a correction with a second gamma coefficient has been performed in advance
  • the corresponding color space in the frame buffer of a target device C is the HSV color space, and a correction with a third gamma coefficient has been performed in advance.
  • the target device B and target device C After performing the process from step 201 to step 208 on the frame data in the target device A, the target device B and target device C, the color space where the frame data is changed to be the sRGB color space, and a same gamma correction process with the same gamma coefficient 2.2 has been performed on the frame data.
  • the target device A, the target device B and the target device C send the frame data in the sRGB color space to their respective displays, the displays represent the same image display effect.
  • steps 203 , 205 , and 207 described above are optional.
  • the color adjustment method by performing the de-gamma correction process on the frame data in the frame buffer, mapping the de-gamma corrected frame data to the linear target color space, and performing the gamma correction process on the frame data in the linear target color space to obtain the frame data in the target color space, the consistent display effect of the same frame data on different devices is realized.
  • the color adjustment method provided in the present disclosure, by dispersing the length of the data in each color channel of the frame data in the linear original color space from the first bit length to the second bit length, which is greater than the first bit length, the accuracy of the frame data is improved, thus reducing the deviation caused in subsequent conversion process.
  • the target device may optimize the color correction matrix and the color space conversion matrix to one conversion matrix, and use the optimized conversion matrix to process the frame data, such that the target device needs to perform only one matrix conversion calculation to map the frame data from the linear original color space to the linear target color space and complete the correction on the frame data.
  • the target device may also use hardware to realize the algorithms such as the matrix calculation in the present disclosure, in which the hardware may be hardware with computation capacity such as a microcontroller.
  • the target device may, according to the respective values of the frame data in respective original color spaces and the corresponding values of the frame data in the target color space, obtain a data conversion relationship for converting the frame data between respective color spaces and generate a look-up table according to the data conversion relationship.
  • the target device may use the look-up table to perform the subsequent frame data conversion process.
  • the target device may directly map respective values of the frame data in the original color space to respective values of the frame data in the target color space according to the conversion relationship.
  • the target device may also download the look-up table from other devices, and perform the subsequent frame data conversion process according to the look-up table.
  • the target device may also download the look-up table from other devices, and perform the subsequent frame data conversion process according to the look-up table.
  • FIG. 3 is a block diagram of a color adjustment apparatus according to an exemplary embodiment.
  • the color adjustment apparatus is applied in a target device, and as shown in FIG. 3 , the color adjustment apparatus comprises an obtaining module 310 , a de-gamma correction module 320 , a mapping module 330 , and a gamma correction process module 340 .
  • the obtaining module 310 is configured to obtain frame data from a frame buffer.
  • the de-gamma correction module 320 is configured to map the frame data obtained by the obtaining module 310 from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space.
  • the mapping module 330 is configured to map the frame data obtained by the de-gamma correction module 320 from the linear original color space to a linear target color space, so as to obtain frame data in the linear target color space.
  • the gamma correction process module 340 is configured to perform a gamma correction process on the frame data obtained by the mapping module 330 in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • the color adjustment apparatus by performing the de-gamma correction process on the frame data in the frame buffer, mapping the de-gamma corrected frame data the linear target color space, and performing the gamma correction process on the frame data in the linear target color space to obtain the frame data in the target color space, the consistent display effect of the same frame data on different devices is realized.
  • FIG. 4 is a block diagram of a color adjustment apparatus according to an exemplary embodiment.
  • the color adjustment apparatus is applied in a target device, and as shown in FIG. 4 , the color adjustment apparatus comprises an obtaining module 410 , a de-gamma correction module 420 , a mapping module 430 , and a gamma correction process module 440 .
  • the obtaining module 410 is configured to obtain frame data from a frame buffer.
  • the de-gamma correction module 420 is configured to map the frame data obtained by the obtaining module 410 from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space.
  • the mapping module 430 is configured to map the frame data obtained by the de-gamma correction module 420 in the linear original color space to a linear target color space, so as to obtain frame data in the linear target color space.
  • the gamma correction process module 440 is configured to perform a gamma correction process on the frame data obtained by the mapping module 430 in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • the de-gamma correction module 420 comprises a gamma coefficient obtaining sub-module 421 and a frame data mapping sub-module 422 .
  • the gamma coefficient obtaining sub-module 421 is configured to obtain a gamma coefficient.
  • the gamma coefficient is a coefficient to be used by a target device for performing a gamma correction process on the frame data in the linear original color space at an operation system layer or at an application layer.
  • the frame data mapping sub-module 422 is configured to perform a de-gamma correction process on the frame data in the original color space by using the gamma coefficient obtained by the gamma coefficient obtaining sub-module 421 , so as to obtain the frame data in the linear original color space.
  • the color adjustment apparatus further comprises a color correction matrix obtaining module 450 and a frame data correction module 460 .
  • the color correction matrix obtaining module 450 is configured to obtain a color correction matrix of the target device, the color correction matrix being a deviation matrix obtained in the target color space according to deviations between color data of the target device and standard color data.
  • the frame data correction module 460 is configured to correct the frame data in the linear target color space by using the color correction matrix obtained by the color correction matrix obtaining module 450 , so as to obtain corrected frame data in the linear target color space.
  • the color correction apparatus further comprises a data dispersing module 470 .
  • the data dispersing module 470 is configured to disperse data in each color channel of the linear original color space, so as to extend a length of the data in each color channel from a first bit length to a second bit length, in which the second bit length is greater than the first bit length.
  • the color adjustment apparatus further comprises a data length recovering module 480 .
  • the data length recovering module 480 is configured to change the data length of the data in each color channel of the frame data in the target color space from the second bit length to the first bit length, if displaying the length of the data in each color channel of the frame data in the target color space as the second bit length is unsupported by the target device.
  • the color adjustment apparatus by performing the de-gamma correction process on the frame data in the frame buffer, mapping the de-gamma corrected frame data to the linear target color space, and performing the gamma correction process on the frame data in the linear target color space to obtain the frame data in a target color space, the consistent display effect of the same frame data on different devices is realized.
  • the color adjustment apparatus provided in the present disclosure, by extending the length of the data in each color channel of the frame data in the linear original color space from the first bit length to the second bit length, and the second bit length is greater than the first bit length, the accuracy of the frame data is improved, and the deviation caused in subsequent conversion process may be reduced.
  • a color adjustment apparatus may realize the color adjustment method provided in the present disclosure, and comprises a processor and a memory configured to store instructions executable by the processor.
  • the processor is configured to: obtain frame data from a frame buffer; map the frame data from an original color space to a linear original color space via a de-gamma correction process, so as to obtain frame data in the linear original color space; map the frame data in the linear original color space to a linear target color space, so as to obtain frame data in the linear target color space; and perform a gamma correction process on the frame data in the linear target color space by using a target gamma coefficient, so as to obtain frame data in a target color space.
  • FIG. 5 is a block diagram of a color adjustment device 500 according to an exemplary embodiment.
  • the color adjustment device 500 may be a mobile phone, a computer, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a fitness equipment, a Personal Digital Assistant PDA, etc.
  • the color adjustment device 500 is the target device.
  • the color adjustment device 500 may comprise the following one or more components: a processing component 502 , a memory 504 , a power component 506 , a multimedia component 508 , an audio component 510 , an Input/Output (I/O) interface 512 , a sensor component 514 , and a communication component 516 .
  • the processing component 502 typically controls overall operations of the color adjustment device 500 , such as the operations associated with display, telephone calls, data communications, camera operations, and recording operations.
  • the processing component 502 may comprise one or more processors 520 to execute instructions to perform all or part of the steps in the above described methods.
  • the processing component 502 may comprise one or more modules which facilitate the interaction between the processing component 502 and other components.
  • the processing component 502 may comprise a multimedia module to facilitate the interaction between the multimedia component 508 and the processing component 502 .
  • the memory 504 is configured to store various types of data to support the operation of the color adjustment device 500 . Examples of such data comprise instructions for any applications or methods operated on the color adjustment device 500 , contact data, phonebook data, messages, pictures, video, etc.
  • the memory 504 may be implemented using any type of volatile or non-volatile memory devices, or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory, a magnetic or optical disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read-only memory
  • EPROM erasable programmable read-only memory
  • PROM programmable read-only memory
  • ROM read-only memory
  • magnetic memory a magnetic memory
  • flash memory a flash memory
  • the power component 506 provides power to various components of the color correction device 500 .
  • the power component 506 may comprise a power management system, one or more power sources, and any other components associated with the generation, management, and distribution of power in the color adjustment device 500 .
  • the multimedia component 508 comprises a screen providing an output interface between the color correction device 500 and the user.
  • the screen may comprise a liquid crystal display (LCD) and a touch panel (TP). If the screen comprises the touch panel, the screen may be implemented as a touch screen to receive input signals from the user.
  • the touch panel comprises one or more touch sensors to sense touches, swipes, and other gestures on the touch panel. The touch sensors may not only sense a boundary of a touch or swipe action, but also sense a duration time and a pressure associated with the touch or swipe action.
  • the multimedia component 508 comprises a front camera and/or a rear camera. The front camera and the rear camera may receive external multimedia data while the color adjustment device 500 is in an operation mode, such as a photographing mode or a video mode. Each of the front camera and the rear camera may be a fixed optical lens system or have focus and optical zoom capability.
  • the audio component 510 is configured to output and/or input audio signals.
  • the audio component 510 comprises a microphone (MIC) configured to receive an external audio signal when the intelligent device 500 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode.
  • the received audio signal may be further stored in the memory 504 or transmitted via the communication component 516 .
  • the audio component 510 further comprises a speaker to output audio signals.
  • the I/O interface 512 provides an interface for the processing component 502 and peripheral interface modules, such as a keyboard, a click wheel, buttons, and the like.
  • the buttons may comprise, but are not limited to, a home button, a volume button, a starting button, and a locking button.
  • the sensor component 514 comprises one or more sensors to provide status assessments of various aspects of the color correction device 500 .
  • the sensor component 514 may detect an open/closed status of the color correction device 500 and relative positioning of components (e.g. the display and the keypad of the color correction device 500 ).
  • the sensor component 514 may also detect a change in position of the color correction device 500 or of a component in the color correction device 500 , a presence or absence of user contact with the color correction device 500 , an orientation or an acceleration/deceleration of the color correction device 500 , and a change in temperature of the color correction device 500 .
  • the sensor component 514 may comprise a proximity sensor configured to detect the presence of nearby objects without any physical contact.
  • the sensor component 514 may also comprise a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor component 514 may also comprise an accelerometer sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • the communication component 516 is configured to facilitate wired or wireless communication between the color correction device 500 and other devices.
  • the color correction device 500 can access a wireless network based on a communication standard, such as WIFI, 2G, or 3G, or a combination thereof.
  • the communication component 516 receives a broadcast signal or broadcast associated information from an external broadcast management system via a broadcast channel.
  • the communication component 516 further comprises a near field communication (NFC) module to facilitate short-range communications.
  • the NFC module may be implemented based on a radio frequency identification (RFID) technology, an infrared data association (IrDA) technology, an ultra-wideband (UWB) technology, a Bluetooth (BT) technology, and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra-wideband
  • BT Bluetooth
  • the color adjustment device 500 may be implemented with one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components, for performing the above described methods.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • controllers micro-controllers, microprocessors, or other electronic components, for performing the above described methods.
  • non-transitory computer readable storage medium comprising instructions, such as the memory 504 comprising instructions.
  • the above instructions are executable by the processor 520 in the color adjustment device 500 , for performing the above-described methods.
  • the non-transitory computer-readable storage medium may be a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disc, an optical data storage device, and the like.

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  • Engineering & Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Image Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
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CN201510020420.0A CN104601971B (zh) 2014-12-31 2015-01-15 色彩调整方法及装置
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CN104601971A (zh) 2015-05-06
EP3040967A1 (en) 2016-07-06
BR112016009890B1 (pt) 2023-09-26
BR112016009890A2 (ja) 2017-08-01
MX357644B (es) 2018-07-17
RU2628532C1 (ru) 2017-08-18
MX2016002106A (es) 2016-09-26
JP6605503B2 (ja) 2019-11-13
JP2017509276A (ja) 2017-03-30
EP3040967B1 (en) 2020-02-05
KR101766867B1 (ko) 2017-08-09
WO2016107268A1 (zh) 2016-07-07
KR20160092520A (ko) 2016-08-04
US20160189399A1 (en) 2016-06-30

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